Means for compensating the inertia forces in jaw crushers



H. WEISS Nov. 23, 1965 MEAN FOR GOMPENSATING THE INERTIA FORCES IN JAWCRUSHEHS Filed Aug. 8, 1963 FIG. 2

16 INVENTOR.

HERMANN wuss ATTORNEY United States Patent 0,

3,219,287 MEANS FOR COMPENSATING THE INERTIA FORCES IN JAW CRUSHERSHermann Weiss, Muhlenweg, Germany, assignor to Eisenwerk WeserhuetteA.G., Bad Oeynhausen, Germany, a corporation of Germany Filed Aug. 8,1963, Ser. No. 300,944 Claims priority, application Germany, Aug. 11,1962, E 23,372 6 Claims. (Cl. 241-267) This invention relates to a jawcrusher, of the type used in crushing rocks and other hard materials, inwhich a movable jaw pivotably mounted at one end thereof has anoscillating movement imparted thereto, and more particularly, theinvention relates to such a jaw crusher in which the inertia forces ofthe movable jaw are compensated.

It is known to partially compensate inertia forces in jaw crushershaving a pivotably mounted oscillatable jaw, which inertia forces areproduced by rotation of certain parts of the crusher or by theoscillating movement of the movable jaw, by the use of balance weights,or counter weights, which are connected to the flywheel, the lattergenerally also serving as the drive pulley. However, these heretoforeknown compensating means compensate only for the inertia of the rotatingelements and not of the oscillating elements.

These existing disadvantages and drawbacks are eliminated in the jawcrusher of the present invention by the provision of a mass as acounterbalance, or damper weight, which is suspended in the fashion of apendulum pivotably mounted on the frame of the crusher, which massoscillates in a direction opposite to the oscillation of the movablejaw. The compensating movement is performed by means of a linkage systemconnected between the movable jaw and the mass suspended as a pendulumon the frame of the crusher, while the force to be compensated istransmitted by a crank mechanism provided on an eccentric drive shaft,or by other force transmission means. Thus, a positive connection iseffected between the movable members which guarantees quiet operation ofthe apparatus. The compensating mass which is mounted for oscillation onthe frame of the crusher is connected to the frame by means of a springin a manner such that resonance conditions prevail in the systemconstituted by the mass and spring within the normal operating speedrange of the crusher, so that the stress on the connecting elements islargely relieved. Further, it is possible to make the natural vibrationor oscillation of the compensating mass equal to the crusher speed and,in this case also, the connecting elements are stress relieved.

In combination with the foregoing compensating means, balance weightsmay be provided on the eccentric drive shaft for the compensation of theinertia forces of the rotating masses, these balance weights preferablybeing mounted on the drive shaft instead of on the drive pulley. As aresult of this arrangement, another source of vibrations is eliminatedso that all of the inertia forces of the crusher are completelycompensated.

As a result of the mounting of the balance or damper weights on theeccentric shaft rather than on the flywheel, or combination flywheel anddrive pulley, it is possible to connect the drive pulley with theeccentric shaft through a normal overload or safety clutch such as oneof the known torque-limiting overload safety devices. Very large forces,however, can be produced in the crank end positions in jaw crusherdrives and, for this reason, it is preferable that the torque-limitingdevice be combined with a spring suspension within the crank system.

Such a spring suspension mechanism preferably operates 3,219,287Patented Nov. 23, 1965 See through a lever system because of the largeforces transmitted. It is necessary only that the spring be compressiblethrough a distance corresponding to a part of the length of the totalstroke since at a position of the eccentric, i.e., the position of theeccentric shown in the drawings or revolved from the position shown, thetorque-limiting safety device will be actuated in the case of anoverload.

The invention will be further illustrated by reference to theaccompanying drawings in which:

FIGURE 1 is a sectional view in elevation through one embodiment of ajaw crusher according to the present.

invention, and

FIGURE 2 is. a sectional view taken on line IIII of FIGURE 1 and lookingin the direction of the arrows.

Referring to the drawings, the jaw crusher has a housing or frame 2 anda shaft 1 fixedly secured thereto. A movable jaw 3 is pivotably mountedon the shaft 1 and has, on the side facing the crushing channel 4, areplaceable crushing face 5 which is fabricated from a highlywearresistant material such as case hardened steel, for example. A fixedjaw 6 is secured to the housing or frame end wall 7 opposite thecrushing face 5 on the movable jaw 3. On the opposite side of themovable jaw 3, adjacent the lower end thereof, a lever portion 8 isdisposed upon which presses the thrust transmission element 9, thelatter being supported, by means of the bearings 10, on an eccentricportion 11 of the drive shaft 16. The crushing gap, which is formed atthe lower end of the fixed jaw 6 and the movable jaw 3, may be varied bythe insertion of shims 12 in the thrust transmitting element 9.

A counterweight 14 is connected with the movable jaw 3 through a linkage13 and the weight of the counterweight 14 may be adjusted, in accordancewith the inertia force generated by the movable jaw 3, by addingadditional weight to the counterweight 14. Due to the pivotable mountingof the counterweight 14 and the lever connection 13 to the movable jaw,the counterweight 14 executes oscillating movements in a directionopposite to the oscillations of the movable jaw 3. In some cases, it isdesirable to connect a spring 15 between the counterweight 14 and theframe 2 so that resonance conditions prevail in the system constitutedby the counterweight 14 and the spring 15. The stress on the forcetransmission system is thereby considerably relieved.

The drive shaft 16, having the eccentric portion 11 thereon, is mountedin the frame 2 in suitable bearings and the shaft has adjustablecounterbalance or damper weights 17 fixed thereto. As shown in thedrawings, the combination flywheel and drive pulley 18 is connected withthe drive shaft through the cone clutch 19 and hub portion 20. Theengaging pressure of the cone clutch 19 may be produced by the spring21, for example.

The inertia forces produced by rotation of the eccentric portion 11 ofthe drive shaft 16 are compensated by the counterweights 17 and theinertia forces produced by oscillation of the movable jaw 3 arecompensated by the oscillating counterweight 14. If any unbreakable bodyshould be introduced into the crushing channel 4, the spring 22 iscompressed by the lever 8, whereupon the cone clutch 19 will act uponthe drive pulley 18, i.e., the drive pulley 18 will then rotate freely.

It will be obvious to those skilled in the art that many modificationsmay be made within the scope of the present invention without departingfrom the spirit thereof, and the invention includes all suchmodifications.

What is claimed is:

1. A jaw crusher comprising a frame, a fixed jaw thereon, a movable jawpivotally mounted at one end thereof on the frame, means for oscillatingthe movable jaw, and compensating means connected to the movable jaw andmounted for oscillation in a direction opposite thereto, whereby theinertia forces of the movable jaw are compensated.

2. A jaw crusher according to claim 1 in which the compensating meansincludes a weight mounted for 0scillation about a pivot on the frame andbeing connected to the movable jaw through a linkage.

3. A jaw crusher according to claim 1 in which the compensating means isconnected to the frame by a spring such that resonance conditionsprevail for the system constituted by the compensating means and springwithin the operating speed range of the crusher.

4. A jaw crusher according to claim 1 in which the means for oscillatingthe-movable jaw includes an eccentric shaft having balance weightsthereon.

5. A jaw crusher according to claim 1 in which the means for oscillatingthe movable jaw includes an eccentric shaft having a drive pulleythereon which drives through a torque-limiting overload clutch.

4 6. A jaw crusher according to claim 1 in which the means foroscillating the movable jaw includes a spring suspension means, the pathof which has a length less than that of the crushing stroke.

References Cited by the Examiner UNITED STATES PATENTS I. SPENCEROVERHOLSER, Primary Examiner.

1. A JAW CRUSHER COMPRISING A FRAME, A FIXED JAW THEREON, A MOVABLE JAWPIVOTALLY MOUNTED AT ONE END THEREOF ON THE FRAME, MEANS FOR OSCILLATINGTHE MOVABLE JAW, AND COMPENSATING MEANS CONNECTED TO THE MOVABLE JAW ANDMOUNTED FOR OSCILLATION IN A DIRECTION OPPOSITE THERETO, WHEREBY THEINERTIA FORCES OF THE MOVABLE JAW ARE COMPENSATED.